Dry-dock.



A. ROY.

DRY DOCK. APPLICATION FILED $29123, 1912.

Patented Apr. 8, 1913.

E ,m In:

A exaiz ale] T09 STATES PATENT ()FFIGEQ munnodx.

To all whom it may concern Be it known that I, ALExANnna Ror, a subject of Great Britain, residing in the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Dry-Docks; and I do declare the following to be a clear, full, and

exact description of the same, such as will enable *other's skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to the characters of reference 1 narked thereon, which form a part of this application. V

This invention relates to improvements in dry docks, theobject of the inventionbeing to produce a dry dock from which the watr ma be exhausted without the necessity of using pumps 01- similar power operated devices, but in place of such power operated devices the invention provides a siphoning means which will exhaust the water from the dr dock by means of using the rising and fa ling ofthe tide toproduce a vacuum 5 in an auxiliary tank connected with the dry dock, which vacuum exhausts the water remaining in the" dock. at low tide. In other words, the vessel is floated into the dock at 'high tide which will submerge the auxiliary- ,tank'and then when the water lowers to low tide, the difference between the high tide and low tide is drawn ofi from the dry dock ithrough gates and the lowering of the tide 'draws the water out of the auxiliary tank which causes a vacuum which exhausts the balance of the Water left in the dry dock into said auxiliarytank.

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purposes for which it is designed. These ob ects, I accomplish by means of such structure and relative arrangement of the parts as will fully appear by a perusal of the following specification and claim.

On the drawings similar characters of reference indicate corresponding parts in the several views.

Figure l is a front elevation of the dry dock. Fig. 2 is a top plan view of the same partly broken out.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 designates the bottom of the dry dock, the numeral 2 the side walls, and the Specification of Letters Patent. Assumes filed September 23, 1912. Serial No. 721,768.

numeral 3 designates the rear wall. Thesewallsmay be formed 'of concrete or any other suitable material. The forward end of the dock is provided with hinged gates 5 upper end of an auxiliary tank 11 made of a any suitable material and suitably reinforced and braced to withstand the strain of the suction and pressure of the water passing therethrough. The upper end of said auxiliary tank 11 is disposed at substantially the water line of high tide and the lower end at substantially the Water line of low tide. A valve 12 provided with an operating handle 13 discharges from the tank 11 just above the low tide mark as shown in the drawings.

In practice, the ship is floated into the dock at high tide and the gates 5 are then closed. tide, the valves 6 are opened which lets the water out of the dock to the level of low tide by means of gravity alone,- after which the valves 12-10 in the chamber are 0 ened and as the water recedes to low tide it rains the water out of the tank 11 to its level which leaves a vacuum between the level of the water in said tank and the top of said tank. which vacuum will then exhaust the water from the dry dock below the valves 6 and thus when the tide has receded toits lowest ebb, the tank 11 will have exhausted the water from the dock which will leave such dock dry.

From the foregoing descriptionit will be readily seen that I have produced such a.

device as substantially fuliils the'objects 0f the invention as set forth herein.

While this specification sets forth in detail the present and preferred @nstriiction of the device, still in practice'such deviations from such detail'may be resorted to as do not form a departure from the spirit of the invention.

7 Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is :7 A device of the character described com- Then as the water recedes to low Patente d'Apr. 8,1913.

prising a dock having gates, valves in said In testimony whereof I affix my signature I gates dlsposed al: apredetermmed pomt in presence of two WltIlGS as.

thereon an auxillar tank connected wlth T a the lower end of such dock by pipes, and a- ALEXALDER 5 valve leading from such tank 'at a point Witnesses:

substantially in alinemenb with the lower M. E. DAn rNELL,

end of the valves in said gates, as described. D. E. ALEXANDEB 

